Sand seel structure



March 13, 1928.

R. R. BLOSS ET AL SAND REEL STRUCTURE Filed May 21, 1927 3 Sheets-Sheet 1 Pay C PfZ/Y E/mer 5. Maura/- I N VEN T0R5 ATTORNEYS March 13, 1928.

} 1,662,775 R. R. BLoss ET 'AL SAND REEL STRUCTURE i e May 21, l927 3 Sheets-Sheet 2 f/mer 5. Maurer IN VEN TORS A TTORNEYS.

March 13, 1928. 1,662,775

R. R. BLOSS ET AL SAND REEL STRUCTURE Filed May 21, 1927 3 Sheets-Sheet 3 IN V EN TORS A TTORNEYS.

Patented Mar. l3, 1%28.

RICHARD R. 'BLOSS, BUY 0.

PFEIL, AND 3.

means MAURER, or sonar-anus, OHIO,

ASSIGNORS TO EN'TEF IATIOIJAL DERRICK do EQUIPMENT COMPANY, OF CO- LUMBUS, OHIO, A CGRPORATION O13 OHIO.

SAND-REEL STRUCTURE.

. Application filed May 21, 1927.

Our invention relates to sand reel structure.

It has to do primarily with chain driven reels and particularly with the means for efiecting driving and braking of the sand reel shaft. It also aims to meet certain conditions already existing in sand reel structures generally in use at the present time.

At the present time, it is common practice in drilling and bailing of oil gas or artesian wells to use either friction driven sand reels with a back brake equipment or chain driven sand reels, the latter being more or less a re cent development.

Our invention aims to provide a novel and superior type of chain driven sand reel.

further aims to provide a unitary driving and braking mechanism which may either be installed as a part of a sand reel or which may be installed upon a. sand reel shaft which is already in use.

In connection operating mechanism.

One feature of our invention consists in the provision of a drum with a brake band operating on the outside for stopping the rotation thereof at any desired point and with a clutch band operating on the inside for effecting rotation of the drum whenever desired.

The structure is such as to provide a maximum of simplicity and efiiciency.

Another feature of our invention consists in the provision of a single means for moving either the clutch into driving relation to the drum or for rendering the brake band structure efiective to check rotation of the sand reel.

This single means comprises a plurality of levers and operating links which are of such form and so arranged as to reduce the number of levers necessary to a minimum and, at the same time, to insure that either the clutch or the brake band struc ture may be moved to driving position or that both may be moved to neutral with minimum of efi'ort.

position Serial No. 193,332.

Another feature of our invention resides in the fact that we have provided a driving sprocket which is so mounted upon the band wheel shaft and has such parts associated therewith as to insure proper alignment of the driving and driven sprockets of the sand reel structure without exceeding the space already existing in the majority of units in the field at the present time.

In order to obtain this proper alignment and, at the same time, to provide a structure capable of fitting units already installed, we have devised a novel structure. One of the features of this novel structure consists in the provision of acollar or sleeve upon the hand wheel shaft which bears firmly against the driving sprocket carried by the shaft and prevents longitudinal movement of the shaft as well as bracing the sprocket against waddling. This sleeve is preferably secured against movement on the band wheel shaft and it slidably supports a movable jaw clutch member which cooperates with clutch teeth upon the sprocket. This provides a compact and eflicient structure which makes possible the proper alignment of the driving and driven sprockets of the sand reel structure and which does not exceed the space limits indicated.

The preferred embodiment of our invention is shown in the accompanying drawings wherein similar characters of reference des ignate corresponding parts and wherein Figure l is a perspective view of our sand reel unit without the driving sprocket mechanism.

Figure 2 is a perspective view of the driving and braking unit which we preferably utilize in our invention.

Figure 3 is a perspective View of our clutch l and unit which is insertible into and removable from our drum as a unit.

Figure l a detail view of one of the cams utilizedby us.

Figure 5 is a sectional .view taken on line of Figure 6 of a means for supporting and adjusting each of our cams.

F1 gure 6 is a side elevation of a means for regulating the amount of adjustment and for indicating when the clutch bands are worn to an extent requiring removal.

Figure I a, sectional view taken on line 77 of Figure 8 showing our driving sprocket'which is normally carried upon the band wheel shaft. 7

Figure 8 is a section taken on line 8-8 of Figure 7 Figure 9 is a perspective view, partially in section, showing-the manner 01 mounting our movable clutchmember for the driving gear.

F igure 10 is a diagrammatic view illustrating the sand reel shaft, the band wheel shaft and the sprocket and chain for transmitting power.

Figure 11 a detail, in section, of a modified form of clutch band which we may use.

Figure 12 is a longitudinal section showing our clutch drum and means whereby the bore of the hub may be varied to accommodate various sand reel sha'its.

Figure 13 is a perspective view of a modification of our clutching and braking unit, wherein the clutch parts are also used as braking parts.

Figure 1-1 is a perspective view of a modified form of clutclroperating mechanism which we may utilize.

In the drawings, our sand reel structure is shown mounted upon skids 1. It comprises bearingsQ and 3 and a shaft 4;. It also comprises the reel 5 and a driving and braking unit.

The driving and braking unit, in its entirety, is best illustrated in Figures 1 and 2. It comprises a hollow drum 6 with spaced outer peripheral flanges 7. These peripheral flanges term a channel. for a brake band 8 having the usual lining 9 of asbestos or other materia One end of the brake band 8, as shown in Figure 1, is provided with a connecting element 10 that is in turn connected to one of the skids 1 by means of bolts 11. The other end of the brake band (as shown in Figures 1' and 2) is also provided with a connecting; element 12 that is secured to the free end of a lever 13 which is tulcrumed at 14c and is designed to be operated to apply or release the brake hand by a reach rod 15. This lever 13 is also connected to a removable clutch. element in a manner that will be described hereafter.

The drum 6 carries an integral web 1.6 and an integral hub 17 which is concentric with. the outer periphery of the drum and which extends inwardly as a cylindrical member. This cylindrical member is designed to receive, upon its periphery, a clutch frame which is illustrated in Figure 3 and which will subsequently be described in detail.

The hub 17 may be bored to accommodate standard size sand reel. shafts. This hub is keyed to the shaft 4, asat 21 and is held in position; on the shaft lby the set screws '16.

Our clutch frame is shown best in Figure 3. It comprises a flange 18 and a ceu tral hub member 19 which is designed to fit upon the hub member 17 in the manner shown in Figure 2. It further comprises radially extending arms 2) which are bifurcated as at 9.1. These bifurcations 21 are designed to support fixed ends of the clutch bands 2:2 pivotally n'iounted as at The clutch bands carried by this bifurcated arm 20 are designated by the numeral and are substantially semi-circular in form. '.l\vo clutch bands are shown but good results may be obtained by using only one of such bands.

The opposite ends of these clutch bands are relatively free, being normally drawn inwardly by coil springs which conne to the shoes 9-6 oi the clutch bands and which also connect to the radially extendi ele-.

pending them against the internal periphery of the drum (5. Te have accon'iplished this by a novel mechanism, embodying cams which serve to force the relatively free ends of the clutch bands outwardly against the tension of springs This operating mechanism is illustrated in detail, in Figures 2, 3 and 1.

The shoes 26 upon the relatively free ends of. the clutch bands are provided with lugs 27', as shown in Figures 3 and 4;, and these lugs are designedto be contacted and moved to forcethcse free ends outwardly by cams rigidly carried upon shafts 29. These shafts 29 are provided with crank arms 30 which are connected to and. operable by links 31. These links 31 are in turn. ope itcd by bell crank levers 32 fulcrinned at 3-3 upon th members 20 and having their opposite ends pivotally connected to operating rods 34. As shown in Figures 2 and 3, the operating rods ez-ztend'through the flange 18 of the clutch frame, through; the driven sprocket structure mounted upon the hub 19, and are connected at their red ueed outer ends to a plate, 35 formed in sections and being a iirt oi a movable collar construction or clutch element 36.

The movable clutch element 36 is preferably formed in sen'li-circular sections 39 designed to be bolted together by bolts 37 extending through lugs 38 upon such sections. These sections of the clutch element 36 are integral with a collar 40 which is likewisein sections andwhi'eh is channeled at itter-the reception of the block 42 of a yoke lever 43. I

The yoke levers?) is fulcrumed as at all andghas its-lower endpivotedas at 45 (see Figure 1) to onetend-ot shell-crank lever 46. This bell-crank lever -16 1S tulcrumed as at 47 and. has-its opposite end pivotec at {18 to av link 4-9, This link all is iivot ed at its opposite end to the lever 1-3 which operates the brake band, being connected thereto on the opposite side of the fulcrum 14: and in between this fulcrum and the connecting point of the reach rod 15.

In operation of these cams, the inward movement of the collar 40 of the movable clutch member towards the drum 6 exerts a force upon the rods 34 by means of the plate 35. This force operates through the bell-crank 32 to move the links 31 radially inward, with the result that the crank arms 30 are swung to force the cams 28 against the lugs 27 upon the relatively free ends of the clutch band. This exerts a powerful pressure upon these free'ends and serves to force the clutch bands into clutching contact with the inner periphery of the drum 6. Such action results in the establishment of a driving contact between the clutch frame and the drum.

The effectiveness of the cam elements .28 in expanding the clutch bands may be regu lated by varying the relation between each cam 28 and its crank arm 30. For instance, in Figure 5, it will be noted that the cam 28 is keyed upon the shaft 29. This shaft 29 extends through the plate 18 of the clutch frame, being supported in this plate by means of a sleeve 57. r

The shaft 29 is provided integrally upon its outer end with an adjusting flange 53 having a lug 5 f upon its periphery. The sleeve 57 is also provided with an integral flange 58 lying outside of the plate 18 and in abutting relation with the flange 53. This flange 58 is also provided with a lug 5%" upon its periphery, this lug being wider than the flange 58 and extending laterally across the periphery of the flange 53.

These flangemembers 53 and 58 are pro vided with a series of apertures 59 which are capable of successive alignment. A bolt 60 is provided and this bolt is adapted to extend through aligned apertures in both flanges, being shown in one pair of aligning apertures in Figures 5 and 6.

The crank arm 30 is loosely mounted on the shaft 29 but has its hub laterally extended to form a sleeve 30. This sleeve 80 is provided with an additional angular extension 55 which fits into a eomplemental socket 56 of-the sleeve 57, so that movement of the crank arm 30 will be transmitted to the sleeve'57 to oscillate the same with the result that,whenever this sleeve 57 is'bolted to the shaft 29 through the medium of the abutting flanges 58 and 58 and the bolt 60, the shaft 29 will be oscillated and will consequently .oscillate the cam 28. Normal actuation of this cam 28 to expand its clutch band or relieve it from pressure is effected by the swinging of the crank arm 30, as has been described.

hen it is desired to adjust the cam, the

bolt 60 is removed from one pair of aligning apertures and the adjusting flange 53 is rotated to bring another pair of apertures into alignment, the sleeve 57, flange 58 and cank arm 30 remaining stationary. This rotation of the flange 53 results in rotation of the shaft 29 and in changing the initial operating position of the cam 28 with relation to the lug 27 of the expanding band and with relation to the crank arm 30. Thus, successive adjustments may be made from time to time to compensate for the wear upon the clutch bands. It will be seen that, with this structure, the cam 28 and the arm form a bell-crank and that by means of the adjusting device the angle between the arms of the bell-crank, namely, the cam 28 and the arm 30, can be increased or decreased.

The purpose of the lugs 54 and 5% is to provide an adjusting limit which will pre vent further tightening of the clutch hands after the asbestos or other clutch band lining has become too worn for further eflective use. The lugs 54 and 5d are so mounted that they willcontactwith each other to stop further adjustments when the clutch linings reach a point where they are no longer et fective to the desired degree. This feature is of considerable importance in practical operation because it insures against the 00- a currence of accidents due to the use of clutch hands after they become too worn to be effective and practically does away with the danger of fire caused from sparks from the points where the clutch linings are worn out, allowing metal to rub on metal.

It will be seen from this that we have provided a simple and effective means for compensating for wear of the clutch bands and for lnsuring removal of these hands when worn out. The means of adjustment contemplate varying the operating path of the cams when necessary or desirable. Obviously. similar results could be obtained by varying the length of such paths. Likewise, it will be understood that this adjusting 1nechanism may be utilized to obtain the proper leverage action, regardless of the question of wear. Rotation of the flange 53 in a clockwise direction will serve to tighten the clutch and rotation in a counter-clockwise direction will serve to loosen the clutch.

It will be understood that the reach rod 15 when moved to the full extent in one direction serves to actuate the lever 18 to re lease the brake band 8 and to simultaneously move the movable clutch member into such. position that the clutch bands are expanded to produce a driving contact with the inner periphery of the drum. this last being effected by the action of the cams upon the relatively free ends of the clutch band. On the other hand, movement of the reach rod 15 to its full extent in the opposite direction serves to so move the cams as to permit their lit) contraction by the springs 25 operating upon their relatively free-ends and. atthe same time the lever13 .islefl'ectedlto move the brake bandsinto l faking contact with the outer periphery of the. drum. The controlling mechanism is Constructed .that the cam cannot pass the center of the lug 27, and therefore cannot ,jamb. vIt will alsobeunderstood that the reach rod 15 may be moved to a neutral position, in which no driving contact is established. between the clutch bands and the inner periphery of thedrum and no braking contact is established between the brake bands, and the outer periphery of the drum.

Mountcdnpon thehubmember-19 of the clutch frame is a sprocket unit. This sprocket unit made up of an integral flange 18 on the hubimelnber .19 and of a semi-circular toother'l mel'nber fi2 formed in sections and held to this integral flangeby a sectionalplate G3 and bolts 64. It will be obvious'thatrotationrof the toothed member or sprocket ($2 willresult inrotation of the clutch band ,fran'ie. It will also be obvious that the sectional toothed member may be readily replaced when worn.

Rotation of this sprocket member 62 is designed to be effected. by means of a sprocket chain 65 (see Figure 10). This sprocket chain 65is adapted to be driven by sprocket 66 which is formed in half sections and mounted upon the band wheel shaft 67. The sprocket is provided with-a bushing 68 that is likewise formed in sections and may be given any desiredbore so that it can be applied to band Wheel shafts of any normal size.

This driving sprocket is idly mounted upon the band wheel shaft and is provided with clutch jaws 69 upon one side thereof for cooperation with a movable jaw clutch member 7 O. This movable jaw clutch memher 7 0 is channeled for the reception of suitable operating mechanism and it is splined upon a sleeve 71 which is keyed upon the band wheel shaft 67 and held against lateral movement thereon by set screws 71.

Both the jaw clutch member 70 and the sleeve 71 are formed'in sections and therefore are readily removable and replaceable, just as is the sprocket 66. Furthermore, the sleeve .71 prevents wabbling of the sprocket (i6 and also prevents longitudinal movement of the band wheel shaft 67. Likewise, the mounting of the jaw clutch member upon the sleeve which prevents longitudinal movement of the band wheel shaft and which prevents wabbling of the sprocket so economizes space on the band wheel shaft that our chain driven sand reel unit may be applied to drilling rig structures already existing without exceeding the space already provided therein and at the same time obtain proper alignment of the driving and driven sprockets .ofthe sand reel structures, This structure and'the manner of mounting of these partsas novel-and highly/advantageous because it renders possible the. adaptation of our chain drivensand reel to those drilling rig structures generally in use in the field. today. i

In the modification shown in Figure 11, it will be seen that we have utilized a single clutch band v72 which is secured to the clutch the drum (5 has the web 16 removably con neeted to a hub member 17 by'bolts 20. This hub member 17 may be varied as to bore as desired to accommodate any sand reel shaft likely to be found. .in the field. It may be keyed to the shaft and held thereon by a set screw or set screws 16.. Thus, by selecting a hub having a bore of the proper diameter to fit the shaft on which the mech-. anism is to be disposed, our driving and braking unit may be appliedto any sand reel shaft. 1 V y In the modification shown in Figure 13, the clutch and operating mechanism there for is substantially identical with the clutch and operating mechanism shown in Figures 1, 2 and 3. However, the brakeband mechanism is dispensed with and a drum is used. This drum may be identical withthe drum shown in the other figures or may have its exterior face smooth; in either case no brake band is utilized. Likewise, the reach rod 82 corresponds to the reach rod 15, except that it connects directly to one arm of a bell-crank lever .84. The other end of the bell-crank lever operates a yoke lever 85 for moving the movable clutch member into and out of operative position. Such clutching mechanism may also be used .as a brake since it .is .obvious that a brake would only be desired when the sandreel and asso ciated mechanism is rotating contra-clockwise. By moving the clutch member into engagement, the power and weight of the driving means would tend to rotate the sand reel in the opposite direction, furnishing all the brake necessary under some conditions.

The modification shown in Figure 14 m vides for the substitution of an equalizing yoke 35 for the plate 35. This equalizing yoke is pivotally mounted intermediate its ends as at 91 and is pivoted at its outer ends as at 92 and 93 to rods 94 which are the equivalents of the rods 34 of Figure It will be apparent that this equalizer serves to insure an equal pressure upon the two clutch bands even though one clutch operating cam may be adjusted a little ahead of theother or if, for some reason, one clutch band Wears a little more rapidly than the other.

From this description it Will be seen that we have provided a chain driven sand reel .Another feature arises fromthe fact that the clutch bands are operated by cams with constant lever arms and that these cams exert constant forces, serving to expand the clutch bands against the inner periphery of the drum.

A still further feature arises from the fact that the clutch frame can be easily slid out from the inside of the drum and that this permits relining of the clutch bands without dismantling the entire sand reel.

Another feature arises from the fact that our sand reel may be seated in the same bearing used by a friction drive sand reel, the clutch and brake assembly being introduced to replace the brake and friction drum of a friction drive sand-reel to connect into a chain driven sand reel.

Another feature of our invention arises from the structure of the driving sprocket and its operating mechanism, together with the manner of mounting this structure. This structure is such that we are able to utilize the space normally taken up by the set collar commonly provided with the rig irons. By this method of construction, we are able to reduce the maximum distance required between the front ack post bearing and the hub of the band wheel flange to 10 inches, as against 15 inches required by other chain driven sand reels at present on the market. This. permits the installation of our jaw clutch structure on a standard rig without moving the band wheel or bull wheel.

Another feature of our invention arises from the unusually large lever ratio that we are able to provide by the use of cams for actuating the expanding bands. Thus, we

are able to obtain a very large hand areawhile, at the same time, engagement is easily efiected by a slight pressure on the operating lever. Furthermore, release of the band may be instantly effected without rubbing of loose and noisy members. Likewise, sticking of the clutch is impossible and this, in itself, is very important.

A further feature of our invention resides in the fact that the clutch bands on the inside of the drum have been so arranged that practically all the working parts of the mechanism associated with the friction clutch are enclosed. Such arrangement and construction of parts excludes practically all water, oil, sand and other foreign material from the working parts and, consequently, tends to insure the proper functioning of these parts. The compact nature of the clutch construction, together with the absence of protruding parts, is also an important feature of our invention.

It will be apparent that we have provided a simple, fool-proof method of tightening or loosening the clutch bands and that this adjustment may be made with a minimum amount of time and labor. Furthermore, the adjustment can be accomplished from the outside of the mechanism sothat any one who can loosen or tighten a nut can make the adjustment, that is, no expert mechanic is required. 7 V

' The essential units of our apparatus are readily removable and may be readily transferred from one rig to another. Thus, one reel will serve a number of locations and the transfer can be made with a minimum of difficulty. Likewise, the rigid construction used makes for'longevity and efiicient operation.

Having thus described our invention, what we claim is:

1. Sand reel structure comprising a sand reel shaft, a drum, a band movable into contact with a periphery of said drum, a cam for effecting such movement, and means for adjusting said cam to vary its effectiveness.

2. Sand reel structure comprising a sand reel shaft, a drum, a band movable into contact with a periphery of said drum, a cam for effecting such movement, and means for varying the operative path of said cam.

3. Sand reelstructure comprising a sand reel shaft, a drum, means for clutching said drum, said last means being removable from said drum as a unit.

4. Sand reel structure comprising a sand reel shaft, a drum, clutching mechanism insertible into said drum and operable against the interior thereof, said mechanism being removable as a unit.

5. Sand reel structure comprising a sand reel shaft, a clutch structure, means for adjusting said clutch structure, and means for visually indicating when further adjustment is undesirable.

6. Sand reel structure comprising a sand reel shaft, a driven clutch member, a driving clutch member, a cam for forcing said driving clutch memberinto operative relation to said driven clutch member, and means for adjusting said cam to vary its effectiveness.

7. Sand reel structure comprising a sand Ireel shaft, a driven clutch member, a driving clutch member, a cam for forcing said driving clutch member into operative relation to said driven clutch member, operating mechanism for said cam, and means for changing the initial position of said cam to vary its effectiveness.

8. Sand reel structure comprising a sand reel shaft, a driven clutch member, a drivling clutch member, a cam for forcing said driving clutch member into operative relation to said driven clutch member, operating mechanism for said cam, means for adjusting the path of said cam to compensate for Wear.

'9. Sandreelstructure comprising a sand reel shaft, a drum, a band movable into contact with a periphery ofsaid drum, a cam for effecting such movement, means for adjusting said cam to vary its effectiveness, and means for preventing such adjustment beyond a predetermined point.

10. Sand reel structure comprising a sand reel shaft, a drain, a band movable into con- .insertible into said drum and operable against the interior thereof, said mechanism embodying an expansibleband structure and operatingcam therefor, said band structure and operating cam being removable as a unit.

12. Sand reel structure comprising a sand reel shaft, a drum, clutching mechanism insertible into said drum and operable against the interior thereof, said mechanism comprising cam and operating levers and links and being removable with said cam, levers andlinks as a unit.

v13. Oil, gas and artesian well structure comprising a shaft, a drum, a band movable into contact with a periphery of said drum, a cam for effecting such movement, leverage mechanism for operating said cam, and means intermediate said cam and said 1ever age mechanism for adjusting said cam with relation to said level-age mechanism to,vary its effectiveness.

14. Oil, gas and artesian well structure comprising a shaft, a drum, a band movable into contact with a periphery of said drum,

a camri or effecting suchmovement, a rocking shaft upon which said cam is mounted, a sleeve on said rocking shaft, a lever con- .nected to said sleeve, means for connecting said. rocking shaft and saidsleeve, said means being adjustable to vary the relation betwen said sleeve and said rocking shaft, and means for operating said lever to render said cam effective.

15. Oil, gas and artesian Well structure comprising a sand reel shaft, a driven clutch member, a driving clutch member and a driving sprocket, said driven clutchmember, said driving clutch member and said drivingsprocket being laterally movable as a unit.

16. Oil, gas and artesian well structure comprising a shaft, a driven clutch member, a hub extension on said driven clutch member, a driving clutch member slidable on and off of said hub extension.

17. Oil, gas and artesian well vstructure comprising a shaft, a driven clutch member, a hub extension on said driven clutch mem ber, a driving clutch member slidable on and off of said hub extension and means for securing said driving clutch member upon said hub extension.

18. Oil, gas and artesian wellstructure comprising a shaft, a driven clutch ,mem-

ber, a hub extension on said drivenclutch member, a driving clutch member'inounted on said hub extension and adriving sprocket carried by said driving clutch member.-

19. Oil, gas and artesian wellstructure comprising a clutch member, a hubxfor said clutch member, arm members extending radially from said hub,and brake bands carried by said arm members' 20. Oil, gas and artesian well structure comprising a clutch member, a hub for said clutch member, arm members extending radially from said hub, brake bands carried by said arm members, and v cams carried by said arm members for actuating said brake bands. 7

21. Oil, gas and artesian well structure comprising a clutch member, hub for said clutch member, brake bands carried by said clutch member, operating cams for said brake bands, and arms upon said hub member for carrying said cams.

22. Oil, gas and artesian well structure comprising a shaft, a driven clutch member, a driving clutch member, said members, so constructed that they produce an enclosed space when in operative relation, clutch bands and operating mechanism therefor mounted within such enclosed space and having actuated rods extending through one of said members.

28. Oil, gas and artesian well structure comprising a driven clutch member, in the formbf a drum open at oneside, a driving clutch member normally fitting within said drum, said driving clutch member comprising a disk which closesthe open end of said drum, and brake bands and operating mechanism therefor carried within said enclosed drum.

24. Oil, gas and artesian Well structure comprising a shaft, a drum, clutch mechanism operating against the interior surface of said drum .for driving it, a brake band operating against the exterior surface of said drum for braking it, one end of said band being tied in fixed position, a clutch collar for operating said clutch, a lever for operat ing said collar, a bell crank lever for operating said last named lever, and an operating lever connected on one side of its fulcrum to one end of said bell crank lever and on the other side of its fulcrum to the free end of said brake band.

25. Oil, gas and artesian Well structure comprising a sand reel shaft, a clutch mem- 2O ber on said shaft, a detachable hub structure for said clutch member, a band Wheel shaft, a driving sprocket on said band wheel shaft and a detachable hub member for said sprocket, a driven sprocket on said sand reel shaft, and a sprocket chain for transmitting power from said band wheel sprocket to said sand reel sprocket.

26. A clutch for oil, gas and artesian well structure comprising a drum, expanding band structure, a plurality of cams for effecting such expansion, leverage mechanism for operating said cams, and means for equalizing the effective expanding force for said cam.

In testimony whereof we, hereby, afiix our signatures.

RICHARD R. BLOSS. ROY C. PFEIL. ELMER B. MAURER. 

